Wide abrasive belt



y 23, 1940 E. P. DAHLSTROM 2,209,074

' WIDE ABRASIVE BELT Filed larch 2a, 1938 ///l I) l 1 I 12 4 I3 12. 11 1o INVENTOR. ERIC F? DAHLSTROM BY MW ATTORNEY.

Patented July 2 1940 UNITED STATES PATENT OFFICE F WIDE ABRASIVE BEPT Eric 1. Dahlstrom, Niagara Falls, N. Y., assignor to The Carborundum Company, N. Y., a corporation of Delaware Niagara Falls,

Application March 28, 1938, Serial No. 198,455

2 Claims.

The production of steel sheets in widths appreaching 100 inches has created a demand for abrasive polishing belts of equal or greater width. Because the coating machines in the abrasive industry are not equipped to coat abrasive sheet material in widths wider than 52 inches, attempts have been made to make polishing belts by mounting together segments ofthe regular widthcessful, complaints have been received from the trade because of the high cost of such belts and their great weight. In some instances, where the belts have been subjected to hard usage, the segments have come loose from the liner in a short time.

All of this has resulted in a demand for an improved belt and itis accordingly an object of the present invention to provide an abrasive coated polishing beltthat is free from the above noted objectionable features.

In the accompanying drawing, like numerals of reference refer to like elements in the following specification. V

Figure 1 is a plan view of a fragment of abrasive belt made in accordance with the present invention;

Figure 2 is a sectional view (on an enlarged scale) along the line 1I-II of Figure 1;

Figure 3 is a perspective view of a modified type of liner as it appears .bcforepressing;

Figure 4 is a fragmentary view (on an enlarged scale) of the liner shown in Figure 3 after press- Referring to the drawing, Figures 1 and 2 illustrate a fragment or section of a composite belt which consists of a liner ii, to which'segments l I of coated abrasive sheet material are cemented by a suitable adhesive. The abrasive segments i I have had the abrasive particles and glue skived oil along two of their edges, as indicated at l2 and II, and the adjacent edges of adjacent s'egments are overlapped and cemented'together by a suitable cement, as indicated at.

The liner II is continuous, except for the one joint I4, and may be of cloth, paper or vulcanized fiber. Similarly, the abrasive sheet material ll may have either a paper or a cloth backing. The choice of material depends'u'pon the fuse to which the article is to be put.

The abrasive segments II are cut in the shape of a parallelogram. The lines of juncture between segments are parallel to each other, but they-are not parallel to the axis of the pulleys over which the belt is intended to run. This eliminates hinging at the joints during running and consequent failure of the joints. Other I shapes of segments other than thatillustrated may be used, such as those disclosed in the United States Patent No. 2,059,583, referred to above.

The belt just described is superior in several belt shown in Patent No. 2,059,583.

The overlapping skived joint strengthens the belt at the joining points of the segments, thereby permitting the use of a relatively thin, light and respects to those of the prior art, especially the 1.

cheap liner since the strains are not carried en- 1.

tirely by the liner as was the case in the prior art. The overlapping joints do not have the tendency to come loose like butt joints for the reason that the joint itself is a stronger and smoother joint and, because the segments are U I attached to one anoth'enthe liner can not stretch.

Figure 3 illustrates a type of liner that may v be usedin the belt just described, in place of the liner shown, where extreme strength combined with extreme flexibility is necessary.

The liner shown in Figure 3 is made by winding a sheet of medium weight fabric, or other flexible material of the width desired, in a continuous spiral, and cementing each layer to the adjacent layer. As many: layers as are necessary to give 30 the required characteristics may be used;

As shown more clearly in Figure 4, ,the beginning end of the liner and the finishing end both terminate at a point adjacent one another, but

not overlapping. Figure 3 shows the liner be- 86 fore the section adjacentthe ends of the fabric is pressed. Figure 4 shows how the material in the vicinity of the joint appears after it has been subjected to the action of a hydraulic press. The

beginning end has been forced inwardly and the 0 finishing end has been forced outwardly giving a uniform thickness throughout the entire length of the liner.

' Having thus described my invention, I claim:

LAn abrasive belt comprising a continuous (I one joint liner and ,a plurality of segments of abrasive-coated .sheetmaterial intimately united to a side of the said liner, each of said segments being attached to the adjacent segments by a overlapping one another, the overlapping portions of said segments being adhesively secured together.

8310 P. DAHLSTRJOM. 

